Glasses with a chemical formula of 5TeO2–10GeO2-78B2O3– ( \(\:7-x\) )MgO– \(\:x\) Tm2O3, where \(\:x\) =( \(\:0\le\:x\le\:1.5\) ) mol%, have been prepared by utilizing the melt quenching procedure. The calculated oxygen molar volume ( \(\:{V}_{o}\) ) and packing density of oxygen (OPD) are observed to differ from (7.803 to 7.097 cm3/mol) and from (128.16 to 140.906 atom/cm3) respectively. As the increase of Tm2O3, longitudinal velocity \(\:{V}_{L\:}\) increment from 4525 to 4842 m/s, while transverse velocity \(\:{V}_{T\:}\) raised from 2635 to 2793 m/s. The elastic constant increases with increasing ( \(\:\rho\:\) ) or \(\:{V}_{L\:}\) & \(\:{V}_{T\:}\) . This makes the glasses more compact. The Makishima-Mackenzie mode is effective for the investigated glasses, and it provides a good agreement between experimental calculations and the model’s predictions. The radiation shielding parameters were included in the current investigation like linear attenuation coefficient (LAC), mean free path (MFP), half-value layer (HVL), and fast removal neutron cross-sections (FRNCS). These parameters were enhanced by increasing the concentration of thulium ions in the fabricated glasses. Especially, the glass specimen with 1.5 mol% of thulium is a promised composition for use in radiation shielding protection in medical applications and reactors.
